Patent Application
20200099901
This application claims the priority benefit of China application serial no. 201811124177.7, filed on Sep. 26, 2018. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
The disclosure relates to a display device, and more particularly to a projection device and a light source module thereof and a method of synchronizing wavelength conversion wheel and filter wheel.
A projector is a display device for generating a large-sized frame. The imaging principle of the projector is to convert the illumination beam generated by a light source module into an image beam through a light valve, and then the image beam is projected onto a screen or wall through the lens to form an image. With the advancement of projection technology and the reduction of manufacturing costs, the use of projectors has gradually expanded from commercial use to household use.
In the structure of a laser projector, it mainly produces a beam of a desired color by making a blue laser beam to sequentially pass through a wavelength conversion wheel and a filter wheel. A projection device with such structure requires synchronization of the wavelength conversion wheel and the filter wheel. In general, the wavelength conversion wheel and the filter wheel are controlled to synchronize by an image processor, but in the circumstances where the image processor does not have the function of controlling the wavelength conversion wheel and the filter wheel to synchronize with a digital micro-mirror device, it is impossible for the projection device to display the image frame normally.
The information disclosed in this BACKGROUND section is only for enhancement of understanding of the BACKGROUND section of the described technology and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Further, the information disclosed in the BACKGROUND section does not mean that one or more problems to be resolved by one or more embodiments of the disclosure was acknowledged by a person of ordinary skill in the art.
SUMMARY OF THE DISCLOSURE
The disclosure provides a projection device and a light source module and a method for synchronizing a wavelength conversion wheel and a filter wheel, making it possible for the wavelength conversion wheel and the filter wheel to be synchronized in the circumstances where a control unit only supports controlling of one wavelength conversion wheel or filter wheel, such that the projection device can display the image frame normally.
The objectives and advantages of the disclosure may be further understood in the technical features disclosed in the disclosure.
To achieve one or a part or all the objectives or other objectives, an embodiment of the disclosure provides a projection device including a light source module, an imaging component, and a projection lens. The light source module includes a light source, a wavelength conversion wheel, a filter wheel, a first driving unit, a second driving unit, a micro control unit, and a control unit. The light source provides an excitation beam. The wavelength conversion wheel is disposed on a transmitting path of the excitation beam, and converts the excitation beam to generate a converted beam. The filter wheel is disposed on a transmitting path of the excitation beam and the converted beam, and filters a waveband of a portion of the converted beam to generate at least one color light beam. The light source module forms an illumination beam according to the excitation beam and the at least one color light beam. The first driving unit drives the wavelength conversion wheel to rotate. The second driving unit drives the filter wheel to rotate. The control unit controls one of the first driving unit and the second driving unit to drive, and the micro control unit controls the other one of the first driving unit and the second driving unit to drive, such that the wavelength conversion wheel rotates synchronously with the filter wheel. The imaging component is disposed on the transmitting path of the illumination beam to convert the illumination beam into an image beam. The projection lens is disposed on the transmitting path of the image beam and is adapted for projecting the image beam to a projection target.
The disclosure further provides a light source module, including a light source, a wavelength conversion wheel, a filter wheel, a first driving unit, a second driving unit, a micro control unit and a control unit. The light source provides an excitation beam.
The wavelength conversion wheel is disposed on the transmitting path of the excitation beam, and converts the excitation beam to generate a converted beam. The filter wheel is disposed on the transmitting path of the excitation beam and the converted beam, and filters the waveband of a portion of the converted beam to generate at least one color light beam, and the light source module forms an illumination beam according to the excitation beam and the at least one color light beam. The first driving unit drives the wavelength conversion wheel to rotate. The second driving unit drives the filter wheel to rotate. The control unit controls one of the first driving unit and the second driving unit to drive, and the micro control unit controls the other one of the first driving unit and the second driving unit to drive, such that the wavelength conversion wheel rotates synchronously with the filter wheel.
The disclosure further provides a method for synchronizing a wavelength conversion wheel and a filter wheel of a projection device. The projection device includes a wavelength conversion wheel and a filter wheel, the method for synchronizing the wavelength conversion wheel and the filter wheel of the projection device includes the following steps. The rotation state of the wavelength conversion wheel and the rotation state of the filter wheel are detected to generate a first position signal and a second position signal, respectively. A control unit is used to control one of the wavelength conversion wheel and the filter wheel to rotate. The micro control unit is used to control the other one of the wavelength conversion wheel and the filter wheel to rotate according to the first position signal and the second position signal, such that the wavelength conversion wheel and the filter wheel rotate synchronously.
Based on the above, the embodiment of the disclosure controls the rotation of the wavelength conversion wheel and the filter wheel respectively through the control unit and the micro control unit, so that even if the control unit only supports controlling of one wavelength conversion wheel or filter wheel, the wavelength conversion wheel and the filter wheel can still be synchronized to enable the projection device to display the image frame normally.
In order to make the aforementioned features and advantages of the disclosure more comprehensible, embodiments accompanying figures are described in detail below.
Other objectives, features and advantages of the present invention will be further understood from the further technological features disclosed by the embodiments of the present invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
The above and other technical contents, features and effects of the disclosure will be clear from the below detailed description of an embodiment of the disclosure with reference to accompanying drawings. The directional terms mentioned in the embodiments below, like “above”, “below”, “left”, “right”, “front”, and “back” refer to the directions in the appended drawings. Therefore, the directional terms are only used for illustration instead of limiting the disclosure.
Further, the light source module 102 may include a light source 104, a wavelength conversion wheel 106, a filter wheel 108, a driving unit 110, a driving unit 112, the control unit 114, and a micro control unit 116. Specifically, the light source 104 may provide an excitation beam L1, the wavelength conversion wheel 106 is disposed on the transmitting path of the excitation beam L1, and capable of converting the excitation beam L1 to generate a converted beam L2. The filter wheel 108 is disposed on the transmitting path of excitation beam L1 and converted beam L2, and filters the waveband of a portion of the converted beam L2 to filter out the light beam of the unwanted waveband to generate at least one color light beam. With the above configuration of the light source 104, the wavelength conversion wheel 106, and the filter wheel 108, the light source module 102 is capable to form the illumination beam L3 according to the excitation beam L1 and the at least one color light beam.
For example, the light source 104 may be, for example, a blue laser light source that can provide a blue laser beam, and the wavelength conversion wheel 106 may be, for example, a phosphor wheel having a light transmitting region and including phosphor powder disposed thereon, the filter wheel 108 having a transparent region and a plurality of filter regions of different colors. When the blue laser beam provided by the light source 104 illuminates the phosphor powder of the wavelength conversion wheel 106, the phosphor powder is excited by the blue laser beam to emit a yellow light beam (the converted beam L2), and a portion of the yellow light beam may pass through the red filter on the filter wheel 108 to form red light, and a portion of the yellow light beam passes through the transparent region of the filter wheel 108 to form a yellow light beam. In addition, the blue laser beam provided by the light source 104 may be transmitted through a portion of the light transmitting region of the wavelength conversion wheel 106, and then pass through the transparent region on the filter wheel 108 to form a blue light beam, such that the light source module 102 can provide an illumination beam L3 including light beams of different colors.
In the exemplary embodiment, the driving unit 110 is coupled to the wavelength conversion wheel 106 and the control unit 114, and the driving unit 112 is coupled to the filter wheel 108 and the micro control unit 116, wherein the control unit 114 may be implemented as an image processor, for example, but is not limited thereto. The control unit 114 is configured to control the driving unit 110 to drive the wavelength conversion wheel 106 to rotate, and the micro control unit 116 may control the driving unit 112 to drive the filter wheel 108 to rotate in synchronization with the wavelength conversion wheel 106, so that the filter wheel 108 and the wavelength conversion wheel 106 are capable to convert the excitation beam L1 into the illumination beam L3 required for projection. Thus, by providing the micro control unit 116 to control the driving unit 112 to drive the filter wheel 108 to rotate, in the circumstances where the control unit only supports controlling of one wavelength conversion wheel 106 or the filter wheel 108, the wavelength conversion wheel 106 and the filter wheel 108 can still be synchronized, such that the projection device displays the image frame normally.
It should be noted that in other embodiments, the driving unit 110 may also be controlled by the control unit 114 to drive the filter wheel 108 to rotate, and the micro control unit 116 controls the driving unit 112 to drive the wavelength conversion wheel 106 to rotate, such that the wavelength conversion wheel 106 rotates in synchronization with the filter wheel 108. As long as the wavelength conversion wheel 106 and the filter wheel 108 can be rotated synchronously, the disclosure provides no limitation to the control objects of the control unit 114 and the micro control unit 116.
Further, the detecting unit 202 may detect the rotation of the wavelength conversion wheel 106 in the manner as shown in
Specifically, when the projection device 200 is powered on, the control unit 114 may drive the wavelength conversion wheel 106 to rotate before the light source 104 provides the excitation beam L1 to avoid the damage of the wavelength conversion wheel 106 caused by the excitation beam L1. In addition, the micro control unit 116 may also simultaneously control the driving unit 112 to drive the filter wheel 108 to rotate together with the wavelength conversion wheel 106. When the position signal S2 outputted by the detecting unit 204 is determined that the filter wheel 108 is static by the micro control unit 116, the micro control unit 116 may restart the filter wheel 108. If the restart is unsuccessful for a preset number of times, the micro control unit 116 may inform the projection device 200 to display the information that the filter wheel 108 is malfunction. If the filter wheel 108 is successfully restarted, the micro control unit 116 may determine whether the rotation speed of the filter wheel 108 is consistent with the wavelength conversion wheel 106. If the rotation speed of the filter wheel 108 is not consistent with the wavelength conversion wheel 106, the micro control unit 116 adjusts the rotation speed of the filter wheel 108 to be consistent with the wavelength conversion wheel 106.
When the rotation speed of the filter wheel 108 is equal to the rotation speed of the wavelength conversion wheel 106, the micro control unit 116 may lock the rotation speed of the filter wheel 108, and determine whether the phase difference between the wavelength conversion wheel 106 and the filter wheel 108 is within a preset range, if the phase difference is within the preset range, the micro control unit 116 maintains locking the rotation speed of the filter wheel 108. For example,
Then, the control unit is used to control one of the wavelength conversion wheel and the filter wheel to rotate (step S504), wherein the control unit may be, for example, an image processor, but is not limited thereto. Then, the micro control unit is used to control the other one of the wavelength conversion wheel and the filter wheel to rotate according to the first position signal and the second position signal, so that the wavelength conversion wheel and the filter wheel rotate synchronously (step S506). For example, the control unit may be used to control the wavelength conversion wheel to rotate at a preset speed according to the first position signal, and the micro control unit is used to adjust the rotation speed of the filter wheel according to the first position signal and the second position signal, such that the filter wheel has the same rotation speed as the wavelength conversion wheel, and the phase difference between the filter wheel and the wavelength conversion wheel falls within the preset range.
In summary, the embodiment of the disclosure controls the rotation of the wavelength conversion wheel and the filter wheel respectively through the control unit and the micro control unit, so that even if the control unit only supports controlling of one wavelength conversion wheel or filter wheel, the wavelength conversion wheel and the filter wheel can still be synchronized to enable the projection device to display the image frame normally.
The foregoing description of the preferred embodiments of the disclosure has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to best explain the principles of the disclosure and its best mode practical application, thereby to enable persons skilled in the art to understand the disclosure for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the disclosure be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Therefore, the term “the disclosure”, “the present disclosure” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the disclosure does not imply a limitation on the disclosure, and no such limitation is to be inferred. The disclosure is limited only by the spirit and scope of the appended claims. The abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Any advantages and benefits described may not apply to all embodiments of the disclosure. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the present disclosure as defined by the following claims. Moreover, no element and component in the present disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201811124177.7 | Sep 2018 | CN | national |
